diff options
Diffstat (limited to 'src/mame/drivers/electron.c')
-rw-r--r-- | src/mame/drivers/electron.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/src/mame/drivers/electron.c b/src/mame/drivers/electron.c index 9dbc5468a6f..1009dc504a3 100644 --- a/src/mame/drivers/electron.c +++ b/src/mame/drivers/electron.c @@ -1,9 +1,9 @@ // license:BSD-3-Clause // copyright-holders:Wilbert Pol /****************************************************************************** - Acorn Electron driver + Acorn Electron driver By Wilbert Pol - + Hardware Overview ----------------- The Acorn Electron is a budget version of the BBC Micro home computer @@ -18,7 +18,7 @@ Internal ports for cassette storage, RGB/CVBS monitors and TV output Various expansions can be added via the rear expansion port PCB Layout ----------- |-------------------| +---------- |-------------------| |--------| EXPANSION PORT | |-----|---------------------| |---||---------| |MOD | SPKR 16MHz LS169 18VAC|| []18VAC INPUT @@ -33,7 +33,7 @@ PCB Layout Notes: (all IC's shown. Only 16 ICs are used) 6502 - 6502 CPU, clock input 2.000MHz [16/8] ULA - Custom logic chip 12CO21, also containing most of the BBC Micro circuitry - Early PCB revisions used a PLCC68 chip in a socket. Later revisions used a + Early PCB revisions used a PLCC68 chip in a socket. Later revisions used a PGA68 chip soldered directly into the motherboard 4164 - 4164 64k x4-bit DRAM (4 chips for 32kbytes total) ROM - Hitachi HN613256 32k x8-bit MASK ROM containing OS & BASIC @@ -45,10 +45,10 @@ Notes: (all IC's shown. Only 16 ICs are used) PWR - 3-pin power input from internal power supply KBD_CONN - 22-pin keyboard connector SPKR - 2-pin internal speaker connector - + ****************************************************************************** Emulation notes: - + I don't have a real system to verify the behaviour of the emulation. The things that can be done through BASIC programs seem to behave properly (most of the time :). |